Thinly slice the pork shoulder or request your butcher to do it for you.
Marinate the pork with fish sauce, soy sauce, thick soy sauce, oyster sauce, sesame oil, vegetable oil, honey, sugar, garlic salt, black pepper, minced garlic, minced shallots, and minced lemongrass . Mix to combine. If you cannot find thick soy sauce at your local asian market you can substitute it with oyster sauce.
Cover and refrigerate over night or at least a few hours.
Bring the meat back to room temperature. Thread the meat onto the skewers. Do not thread them too close together or too far apart.
Brush some cooking oil onto the pan.
Then coat the pan with some butter.
Place the skewers onto the grill. If the skewers are too long for the grill then just break off an end piece of the skewer.
Cook until browned then flip the meat over. If the grill becomes dry add more butter or oil to the grill.
Best served immediately while hot.
The grilled pork can be served many ways. You can simply eat it with some white rice, place it in between a french baguette, place some grilled pork on top of some Vermicelli noodles with herbs or wrap them in some rice paper with vietnamese herbs & veggies.